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Re: Implementation Report for RDF Data Cube Vocabulary

From: Dave Reynolds <dave.e.reynolds@gmail.com>
Date: Mon, 02 Dec 2013 15:50:54 +0000
Message-ID: <529CAC5E.304@gmail.com>
To: Sebastian Bayerl <bayerl@dimis.fim.uni-passau.de>
CC: Florian Stegmaier <stegmaier@dimis.fmi.uni-passau.de>, "public-gld-comments@w3.org" <public-gld-comments@w3.org>
Hi Sebastian,

Great, thanks for the clarification.

The notion with the Integrity Rules is that you run the normalization 
algorithm [1] first before applying the rules (which is what the online 
validator does). It looks like if you did that IC-3 would pass. So 
indeed that's a (c).

Best wishes,
Dave

[1] http://www.w3.org/TR/vocab-data-cube/#normalize-algorithm

On 02/12/13 15:41, Sebastian Bayerl wrote:
> Hello,
>
> IC-1 and IC-4 fail, because of design decisions we have made in an early
> stage of development -> (b).
> I am not sure how to categorise IC-3. This is a part of the structure,
> which is generated:
>
> code:Dsd-d84556f2-1e1b-4319-9efd-153d6c7b10cd
>        a       qb:DataStructureDefinition ;
>        qb:component [ qb:measure :Water_level ] ;
>
> :Water_level
>        a       rdf:Property , qb:MeasureProperty ;
>        rdfs:label "Water Level" ;
>
> There is no reasoning in the bigdata endpoint and therefore the subclass
> relationship between qb:componentProperty and qb:measure is not
> inferred. Also using a second blank node seems to be problematic here.
> When I use the following query, I get the desired result:
>
> ASK {
>    ?dsd a qb:DataStructureDefinition .
>    ?dsd qb:component [qb:measure ?measure]
>    FILTER NOT EXISTS { ?measure a qb:MeasureProperty }
> }
>
> So it might be a problem with the original ASK query -> (a) or a
> limitation of our environment -> (c).
>
> Cheers,
> Sebastian
>
>
>
>
> On Mon, Dec 2, 2013 at 3:30 PM, Florian Stegmaier
> <stegmaier@dimis.fmi.uni-passau.de
> <mailto:stegmaier@dimis.fmi.uni-passau.de>> wrote:
>
>     Hi Dave,
>
>     Ah, i just see i slightly messed the link to our endpoint. You can
>     check it under:
>
>     http://zaire.dimis.fim.uni-passau.de:8080/bigdata/
>
>     I included a new report to this email. Currently there also exist
>     „early stage“ cubes in the endpoint - it will be reseted in 1 or 2
>     weeks. Regarding the failures, i CCed Sebastian Bayerl, who is
>     responsible for data cubes in our project. He will shortly reply to
>     answer your open questions.
>
>     Cheers.
>     Florian
>
>
>     _____________________________
>     Dipl. Inf. Florian Stegmaier
>     Chair of Distributed Information Systems
>     University of Passau
>     Innstr. 43
>     94032 Passau
>
>     Room 248 ITZ
>
>     Tel.: +49 851 509 3063 <tel:%2B49%20851%20509%203063>
>     Fax: +49 851 509 3062 <tel:%2B49%20851%20509%203062>
>
>     http://twitter.com/fstegmai
>     http://www.mendeley.com/profiles/florian-stegmaier/
>     _____________________________
>
>     Am 02.12.2013 <tel:02.12.2013> um 15:23 schrieb Dave Reynolds
>     <dave.e.reynolds@gmail.com <mailto:dave.e.reynolds@gmail.com>>:
>
>      > Hi Florian,
>      >
>      > Many thanks for the report.
>      >
>      > For the three ICs which you show as failing do you consider these:
>      >
>      > (a) an error in the definition of the IC in the Data Cube
>     specification,
>      >
>      > (b) the nature of your data in its current state (we understand
>     this is ongoing research),
>      >
>      > or (c) some other problem such as limitations of the testing
>     environment for your particular data?
>      >
>      > The critical thing for the W3C process is (a).
>      >
>      > For IC-1 and IC-4 I assume this is b/c but I'm unclear on why
>     IC-3 fails for you and whether you regard this as an issue with the
>     spec.
>      >
>      > [The sparql endpoint is accessible to me, at least at the moment,
>     so I can't investigate directly.]
>      >
>      > Cheers,
>      > Dave
>      >
>      >
>      > On 02/12/13 13:48, Florian Stegmaier wrote:
>      >> Hi Dave,
>      >>
>      >> please find attached our RDF Data Cube Vocabulary implementation
>     report of the FP7 CODE project [1]. It inherits details of the
>     integrity constraints as well as a pointer to the dump where the
>     cubes are hosted. If you need further information, please feel free
>     to contact me.
>      >>
>      >> Side note: Currently, we are finalizing our prototypes covering
>     lifting of statistical data into data cubes, data cube merging
>     techniques as well as visual analytics components. I can share the
>     links to the web prototypes if anybody is interested in!
>      >>
>      >> Cheers,
>      >> Florian
>      >>
>      >> [1] http://code-research.eu/
>      >>
>      >>
>      >>
>      >>
>      >> _____________________________
>      >> Dipl. Inf. Florian Stegmaier
>      >> Chair of Distributed Information Systems
>      >> University of Passau
>      >> Innstr. 43
>      >> 94032 Passau
>      >>
>      >> Room 248 ITZ
>      >>
>      >> Tel.: +49 851 509 3063 <tel:%2B49%20851%20509%203063>
>      >> Fax: +49 851 509 3062 <tel:%2B49%20851%20509%203062>
>      >>
>      >> http://twitter.com/fstegmai
>      >> http://www.mendeley.com/profiles/florian-stegmaier/
>      >> _____________________________
>      >>
>      >
>
>
>
>
>
> --
> __________________________________________________________
> Sebastian Bayerl (M.Sc.)
>
> Chair of Distributed and Multimedia Information Systems
> University of Passau
> Innstr. 43
> 94032 Passau
> Room 246 ITZ
>
> Tel.: +49 851 509 3064
> Fax: +49 851 509 3062
>
> bayerl@dimis.fim.uni-passau.de <mailto:bayerl@dimis.fim.uni-passau.de>
> https://www.dimis.fim.uni-passau.de/
> __________________________________________________________
Received on Monday, 2 December 2013 15:51:24 UTC

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